Water-induced MAPbBr3@PbBr(OH) with enhanced luminescence and stability

Abstract

Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide perovskites. In this paper, the photoluminescence (PL) quantum yield (QY) of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water, and the PL QY of a sample in aqueous solution decreases minimally over 1 year. The enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite (MAPbBr 3)@PbBr(OH). We note that this strategy is universal to MAPbBr 3 , formamidine lead bromide perovskite (FAPbBr 3), inorganic lead bromide perovskite (CsPbBr 3), etc. Light-emitting devices (LEDs) are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV chip. The luminance intensity of the LED is 9549 cd/m 2 when the driven current is 200 mA, and blemishes on the surface of glass are clearly observed under the illumination of the LEDs. This work provides a new strategy for highly stable and efficient perovskites.

Research on the influence of polar solvents on CsPbBr3 perovskite QDs

“…17 In general, the source of their instability is usually attributed to their low formation energy, which makes the properties of these materials vulnerable to external environmental inuences. 18,19 Moreover, environment can affect the existence state of ligand molecules, and the ligand molecules can affect the properties of CsPbX 3 PQDs. It is commonly believed that, the ligands are in harmony with its surface, in addition to the electronic structure, it also affect the chemical and colloidal stability of QDs.…”

Origin of Radioluminescence in Low-Dimensional Halide Perovskite Glass Ceramics under X-ray Excitation

“…Based on our previous study on the photoluminescence mechanism of Cs 4 PbBr 6 QDs, ,, it can be speculated that the broad peak emission and bimodal emission in the RL spectrum are still connected with the Br vacancy. However, as the result displayed in Figure b, the RL intensity of Cs 4 PbBr 6 QDs glass ceramics did not change with the reducing Br vacancy.…”

Assessment of Crystalline Materials for Solid State Lighting Applications: Beyond the Rare Earth Elements

“…Such structures have the general structural formula ABX3, where A is a cation such as a methylammonium (MA), formamidinium (FA) or Cs + ; B is a metal (typically Pb 2+ or Sn 2+ ); and X is a halogen (I, Br). Recently, total inorganic perovskites have also been developed, CsPbX 3 (X = I, Br), showing increased properties compared to organic-inorganic halide perovskites (e.g., MAPbBr 3 and FAPbBr 3 ), and for their higher photoluminescence quantum efficiency and thermal stability [25,26].…”